Based on Warren and Passel's (1984) estimate that nearly two-thirds of Mexican-born noncitizens entering the U.S. during 1975–80 and included in the 1980 Census are undocumented immigrants, this article uses the 1980 Public Use Microfiles to delineate four Mexican origin immigrant status groups — post 1975 Mexican-born noncitizens, pre-1975 Mexican-born noncitizens, self-reported naturalized citizens, and native-born Mexican Americans. The pattern of sociodemographic differences among these groups provides support for the idea that the first two categories contain a substantial fraction of undocumented immigrants. These two groups (especially the first) reveal characteristics that one would logically associate with undocumented immigrants — age concentration (in young adult years), high sex ratios, low education and income levels, and lack of English proficiency.
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